FTPHelper

/// <summary>
    /// FTP帮助类
    /// </summary>
    public class FTPHelper
    {
        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="fileinfo">需要上传的文件</param>
        /// <param name="targetDir">目标路径</param>
        /// <param name="hostname">ftp地址</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
        {
            //1. check target
            string target;
            if (targetDir.Trim() == "")
            {
                return;
            }
            target = Guid.NewGuid().ToString();  //使用临时文件名


            string URI = "FTP://" + hostname + "/" + targetDir + "/" + target;
            //WebClient webcl = new WebClient();
            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);

            //设置FTP命令 设置所要执行的FTP命令，
            //ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;//假设此处为显示指定路径下的文件列表
            ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
            //指定文件传输的数据类型
            ftp.UseBinary = true;
            ftp.UsePassive = true;

            //告诉ftp文件大小
            ftp.ContentLength = fileinfo.Length;
            //缓冲大小设置为2KB
            const int BufferSize = 2048;
            byte[] content = new byte[BufferSize - 1 + 1];
            int dataRead;

            //打开一个文件流 (System.IO.FileStream) 去读上传的文件
            using (FileStream fs = fileinfo.OpenRead())
            {
                try
                {
                    //把上传的文件写入流
                    using (Stream rs = ftp.GetRequestStream())
                    {
                        do
                        {
                            //每次读文件流的2KB
                            dataRead = fs.Read(content, 0, BufferSize);
                            rs.Write(content, 0, dataRead);
                        } while (!(dataRead < BufferSize));
                        rs.Close();
                    }

                }
                catch (Exception ex) { }
                finally
                {
                    fs.Close();
                }

            }

            ftp = null;
            //设置FTP命令
            ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名
            ftp.RenameTo = fileinfo.Name;
            try
            {
                string url = "FTP://" + hostname + "/" + targetDir + "/" + ftp.RenameTo;
                if (FileCheckExist(url, ftp.RenameTo, username, password))
                {
                    //删除
                    FileDelete(url, username, password);
                };

                ftp.GetResponse();

            }
            catch (Exception ex)
            {
                ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除
                ftp.GetResponse();
                throw ex;
            }
            finally
            {
                //fileinfo.Delete();
            }

            // 可以记录一个日志  "上传" + fileinfo.FullName + "上传到" + "FTP://" + hostname + "/" + targetDir + "/" + fileinfo.Name + "成功." );
            ftp = null;

            #region
            /*****
             *FtpWebResponse
             * ****/
            //FtpWebResponse ftpWebResponse = (FtpWebResponse)ftp.GetResponse();
            #endregion
        }

        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="localDir">下载至本地路径</param>
        /// <param name="FtpDir">ftp目标文件路径</param>
        /// <param name="FtpFile">从ftp要下载的文件名</param>
        /// <param name="hostname">ftp地址即IP</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static void DownloadFile(string localDir, string FtpDir, string FtpFile, string hostname, string username, string password)
        {
            string URI = "FTP://" + hostname + "/" + FtpDir + "/" + FtpFile;
            string tmpname = Guid.NewGuid().ToString();
            string localfile = localDir + @"\" + tmpname;

            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
            ftp.UseBinary = true;
            ftp.UsePassive = false;

            using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    //loop to read & write to file
                    using (FileStream fs = new FileStream(localfile, FileMode.CreateNew))
                    {
                        try
                        {
                            byte[] buffer = new byte[2048];
                            int read = 0;
                            do
                            {
                                read = responseStream.Read(buffer, 0, buffer.Length);
                                fs.Write(buffer, 0, read);
                            } while (!(read == 0));
                            responseStream.Close();
                            fs.Flush();
                            fs.Close();
                        }
                        catch (Exception)
                        {
                            //catch error and delete file only partially downloaded
                            fs.Close();
                            //delete target file as it's incomplete
                            File.Delete(localfile);
                            throw;
                        }
                    }

                    responseStream.Close();
                }

                response.Close();
            }



            try
            {
                File.Delete(localDir + @"\" + FtpFile);
                File.Move(localfile, localDir + @"\" + FtpFile);


                ftp = null;
                ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile;
                ftp.GetResponse();

            }
            catch (Exception ex)
            {
                File.Delete(localfile);
                throw ex;
            }

            // 记录日志 "从" + URI.ToString() + "下载到" + localDir + @"\" + FtpFile + "成功." );
            ftp = null;
        }

        /// <summary>
        /// 搜索远程文件
        /// </summary>
        /// <param name="targetDir"></param>
        /// <param name="hostname"></param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <param name="SearchPattern"></param>
        /// <returns></returns>
        public static List<string> ListDirectory(string targetDir, string hostname, string username, string password, string SearchPattern)
        {
            List<string> result = new List<string>();
            try
            {
                string URI = "FTP://" + hostname + "/" + targetDir + "/" + SearchPattern;

                System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectory;
                ftp.UsePassive = true;
                ftp.UseBinary = true;


                string str = GetStringResponse(ftp);
                str = str.Replace("\r\n", "\r").TrimEnd('\r');
                str = str.Replace("\n", "\r");
                if (str != string.Empty)
                    result.AddRange(str.Split('\r'));

                return result;
            }
            catch { }
            return null;
        }

        private static string GetStringResponse(FtpWebRequest ftp)
        {
            //Get the result, streaming to a string
            string result = "";
            using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
            {
                long size = response.ContentLength;
                using (Stream datastream = response.GetResponseStream())
                {
                    using (StreamReader sr = new StreamReader(datastream, System.Text.Encoding.Default))
                    {
                        result = sr.ReadToEnd();
                        sr.Close();
                    }

                    datastream.Close();
                }

                response.Close();
            }

            return result;
        }

        /// <summary>
        /// 在ftp服务器上创建目录
        /// </summary>
        /// <param name="dirName">创建的目录名称</param>
        /// <param name="ftpHostIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void MakeDir(string dirName, string ftpHostIP, string username, string password)
        {
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.MakeDirectory;

                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 删除目录
        /// </summary>
        /// <param name="dirName">创建的目录名称</param>
        /// <param name="ftpHostIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void delDir(string dirName, string ftpHostIP, string username, string password)
        {
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.RemoveDirectory;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 文件重命名
        /// </summary>
        /// <param name="currentFilename">当前目录名称</param>
        /// <param name="newFilename">重命名目录名称</param>
        /// <param name="ftpHostIp">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void Rename(string currentFilename, string newFilename, string ftpHostIp, string username, string password)
        {
            try
            {

                FileInfo fileInf = new FileInfo(currentFilename);
                string uri = "ftp://" + ftpHostIp + "/" + fileInf.Name;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.Rename;

                ftp.RenameTo = newFilename;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();

                response.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        private static FtpWebRequest GetRequest(string URI, string username, string password)
        {
            //根据服务器信息FtpWebRequest创建类的对象
            FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
            //提供身份验证信息
            result.Credentials = new System.Net.NetworkCredential(username, password);
            //设置请求完成之后是否保持到FTP服务器的控制连接，默认值为true
            result.KeepAlive = false;
            return result;
        }

        /// <summary>  
        /// 消除文件  
        /// </summary>  
        /// <param name="filePath"></param>
        /// <param name="username"></param>  
        /// <param name="password"></param>  
        public static bool FileDelete(string filePath, string username, string password)  
        {  
            bool success = false;  
            FtpWebRequest ftpWebRequest = null;  
            FtpWebResponse ftpWebResponse = null;  
            Stream ftpResponseStream = null;  
            StreamReader streamReader = null;  
            try  
            {
                ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(filePath));
                ftpWebRequest.Credentials = new NetworkCredential(username, password);  
                ftpWebRequest.KeepAlive = false;  
                ftpWebRequest.Method = WebRequestMethods.Ftp.DeleteFile;  
                ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();  
                long size = ftpWebResponse.ContentLength;  
                ftpResponseStream = ftpWebResponse.GetResponseStream();  
                streamReader = new StreamReader(ftpResponseStream);  
                string result = String.Empty;  
                result = streamReader.ReadToEnd();  
                 
                success = true;  
            }  
            catch (Exception)  
            {  
                success = false;  
            }  
            finally  
            {  
                if (streamReader != null)  
                {  
                    streamReader.Close();  
                }  
                if (ftpResponseStream != null)  
                {  
                    ftpResponseStream.Close();  
                }  
                if (ftpWebResponse != null)  
                {  
                    ftpWebResponse.Close();  
                }  
            }  
            return success;  
        }  
        /// <summary>  
        /// 文件存在检查  
        /// </summary>  
        /// <param name="ftpPath"></param>  
        /// <param name="ftpName"></param>  
        /// <returns></returns>  
        public static bool FileCheckExist(string ftpPath, string ftpName, string username, string password)  
        {  
            bool success = false;  
            FtpWebRequest ftpWebRequest = null;  
            WebResponse webResponse = null;              
            StreamReader reader = null;  
            try  
            {
                ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath));
                ftpWebRequest.Credentials = new NetworkCredential(username, password);  
                ftpWebRequest.Method = WebRequestMethods.Ftp.ListDirectory;  
                ftpWebRequest.KeepAlive = false;  
                webResponse = ftpWebRequest.GetResponse();  
                reader = new StreamReader(webResponse.GetResponseStream());  
                string line = reader.ReadLine();  
                while (line != null)  
                {  
                    if (line == ftpName)  
                    {  
                        success = true;  
                        break;  
                    }  
                    line = reader.ReadLine();  
                }  
            }  
            catch (Exception)  
            {  
                success = false;  
            }  
            finally  
            {  
                if (reader != null)  
                {  
                    reader.Close();  
                }  
                if (webResponse != null)  
                {  
                    webResponse.Close();  
                }  
            }  
            return success;  
        }  
    
    }